Nail driver for concrete forms



Nov. 8, 1955 .1. KOTT NAIL DRIVER FOR CONCRETE FORMS 2 Sheets-Sheet 1 Filed May 4, 1953 //\/L/E/\/ 75/? JOHN KOTT Nov. 8, 1955 J -r 2,722,683

NAIL. DRIVER FOR CONCRETE FORMS Filed May 4, 1953 2 Sheets-Sheet 2 United States Patent Office 2,722,683 Patented Nov. 8,, 1 955;

2,722,683 NAIL DRIVER FoR CONCRETE FORMS John Kott, Portland, Oreg.

Application May 4, 1953, Serial No. 352,630

8 Claims. (Cl. 1-47) This invention relates generally to carpenters. tools and particularly to a nail driver for concrete forms.

The main object of this invention is to provide a driver which will expedite the driving of nails. into the forms from the side facing the opposite wall of the form.

The second object. is to reduce the amount of time ordinarily required to build a form.

These and other objects are accomplished in the manner set forth in the following specification as illustrated in the accompanying drawing in which Fig. 1 is an elevation view of the device showing the handles in full lines at the completion of a nail driving stroke and showing the handles in broken lines in compact reversely folded position.

Fig. la is an elevation view of the device showing the handles spread apart in preparation for a nail driving operation.

Fig. 2 is a bottom plan view of the device.

Fig. 3 is a partially sectional view along the line 33 of Fig. showing the moving element of the chuck in elevation.

Fig. 4 is a view similar to Fig. 3 but on a different plane through the device showing the driving of a nail in a second step of operation.

Fig. 5 is a section taken along the line 5-5 in Fig. 1.

Fig. 6 is a section taken along the line 66 in Fig. 5.

Fig. 7 is a section taken along the line 7--7 in Fig. 3.

Fig. 8 is a view of the device in use.

Like numbers of reference refer to the same or similar parts throughout the several views.

Referring in detail to the drawings, there is shown in the course of construction a wooden form for a concrete wall, which form includes the upright studs 10 and shiplap 11, each piece being held near its upper edge by a nail 12 which passes through the shiplap 11 into a stud 10. Concrete reinforcing steel 42 (not shown in Fig. 8) a short distance from the shiplap 11 obstructs the swinging of a hammer to drive the nails 12 in the usual way.

My device is comprised of a system of levers, the purpose of which is to bring a driving pressure against the head 13 of the nail 12 from the side of the form where it is difiicult to manipulate an ordinary hammer. The leverage shown is merely by way of illustration, and includes a pair of handles 14 joined at one end by a bolt 15 which affords a hinging action to the handles 14. Between the bolt 15 and the ends of the handles 15 are the bolts 16 and 17.

The handle end 18, through which extends the bolt 17 is slotted to receive the pull rod 19 through which the bolt 17 passes. The rod 19 has formed on its end 20 a driver head 21, which is formed as an extension on one side of the rod 19. In the cylindrical portion 22 of the head 21 is formed a cylindrical recess 23 in which is slidably mounted a button 24. Also slidably mounted in the portion 22 is a nail holding jaw 25 adapted to engage a nail 12 at the center of the cylindrical portion 22. Projecting from the jaw 25 are the integral parallel pins 26 and 27, which extend into the button 24. The pin 26 carries a compression spring 28 and a rivet 29 secures the button 24 to the pin 26.

Between the recess 23. and the jaw 25 is a stationary portion of the jaw 30. Both of the jaw members 25 and 30 are grooved to receive a nail 12 between them. A pressure on the button 24 will push the jaw 25 outwardly and release the nail 12. The face 31 is roughened for the second step of the driving operation. Along the axis of the portion 22 is a round hole 32,. through which the nail head 13 can freely pass.

Attached to the bolt 16 are a pair of levers 33 which fulcrum on the bolt 34 which passes through the rod 19 near the middle of its length. Also attached to the bolt 34 are the fork arms 35 between whose parallel ends 36 is mounted a back up roller 37 which turns on the bolt 38.passing through the ends 36. v

The levers 33 extend ahnost to the roller 37 which is supported near its middle by a wheel 39 mounted on a bolt 40 which passes through both members. 33. The wheel 39 acts as a rotatable bearing surface for the roller 37. A tubular brace 41 joins all of the members 36 and 33.

The purpose of the elongated roller 37 is to enable the setting diagonally of the stud 10, as shown in Fig. 8.

In the operation of the device the button 24 is first depressed and a nail 12 inserted in the driving head. The device is then moved into position with the driving face 31 on the inner side of the shiplap 11 and the roller 37 engaging the outer side of a stud 10. The handles 14 are then moved together which forces the nail 12 to the position shown in dotted lines in Fig. 3. The button 24 is again depressed, or the head 21 may be backed off the nail without depressing button 24, releasing the nail 12 from the jaws 25 and 30. Now, in a second step of the operation, the driving face 31 is moved against the nail 12 and the handles 14 again brought together which drives the nail 12 home. It can be seen that by a relatively simple operation form nails can be driven in places ordinarily inaccessible, with a minimum of effort.

The driving action is obtained due to the fact that the roller 37 swings on an are about the bolt 34, forcing the roller 37 against the stud 10 and, since the stud 10 is fixed, the rod 19 must slide longitudinally, driving the nail 12 before it.

In Fig. 1 the handles 14 are shown in broken lines in folded position when the device is not in use. The handles are shown in full lines in the approximate position assumed at the completion of each of the two steps of the driving operation. At the beginning of each step the handles are wider apart, as shown in Figure 8. When the handles are brought together from a wide open position the movement of roller 37 on stud 10 shortens the distance between head 21 and the outside face of the stud against which the roller bears. Roller 37 moves'in an are about bolt 34 whereby the nail is driven a distance equal to the amount the cosine of the angle between 20 and 36 is increased as the angle becomes smaller.

I claim:

1. A nail driver for concrete forms having in combination a nail driving head having means for releasably holding the head end of a nail within said driving head,

a pull rod having one end rigidly supporting said driving A head, a lever pivotally attached to said pull rod, a pair of arms attached to said lever forming a fork, a back up roller mounted across said fork, and means for forcibly moving said pull rod and lever toward a parallel position.

2. The device as described in claim 1 characterized by said back up roller being sufficiently elongated to permit its rolling diagonally of a supporting stud on the form.

3. The device as described in claim 2 characterized by 3 having said elongated roller supported at the middle of its length by a Wheel on said lever bearing against said roller.

4. A nail driver for concrete forms and the like comprising a pair of pivotally interconnected levers, a driving head on one of said levers adapted to hold a nail in approximate alignment with said one lever, a roller on the other lever adapted to roll on a portion of said form, and means for swinging said levers in relative movement about said pivotal connection.

5. A nail driver for concrete forms and the like comprising a pair of pivotally interconnected levers, a driving head on one of said levers adapted to hold a nail in approximate alignment with said one lever, a roller on the other lever adapted to roll on a portion of said form, and a pair of handles pivotally connected with said levers in compound leverage.

6. A nail driver for concrete forms and the like comprising a pair of pivotally interconnected levers, an offset head on one of said levers, means in said head for holding a nail parallel with said one lever in a first driving step to start the nail, a surface on said head perpendicular to said one lever for completing the driving of a started nail in a second step, a swinging end on the second lever having a roller movable in an are generally transversely of a nail held in said head but having a component of said arcuate movement parallel with the direction of said held nail, and means for swinging said second lever relative to said first lever on said pivotal connection.

7. A nail driver for concrete forms and the like comprising a pair of levers having a pivotal interconnection and extending in the same general direction from said pivotal connection at a variable divergent angle, a driving head on one of said levers offset laterally in the direction of the other lever, means in said driving head for holding the head of a nail with the point directed approximately toward said pivotal connection, said other lever being shorter than said one lever, and a roller on said shorter lever parallel with the axis of said pivotal connection.

8. A nail driver for concrete forms and the like comprising a long lever and a short lever pivotally interconnected, a roller abutment on the end of said short lever, an offset driving head on the end of said long lever, a driving face on said head perpendicular to said long lever and facing said pivotal connection, and a spring jaw chuck in said head arranged to hold the head of a nail with its point projecting beyond said face and directed approximately toward said pivotal connection.

No references cited. 

